A118911 Row sums of triangle in A128973.

1, 1, 3, 3, 3, 3, 5, 5, 3, 3, 9, 9, 5, 5, 11, 11, 3, 3, 9, 9, 9, 9, 15, 15, 5, 5, 15, 15, 11, 11, 21, 21, 3, 3, 9, 9, 9, 9, 15, 15, 9, 9, 27, 27, 15, 15, 33, 33, 5, 5, 15, 15, 15, 15, 25, 25, 11, 11, 33, 33, 21, 21, 43, 43, 3, 3, 9, 9, 9, 9, 15, 15, 9, 9, 27, 27, 15, 15, 33, 33, 9, 9

Offset: 0

Author

Philippe Deléham, May 02 2007, Jan 06 2008

Keywords

• nonn

Comments

Integers in A071053 repeated.

Crossrefs

Cf. A071053, A128973.

Formula

a(2*n) = a(2*n+1).

a(n) = Sum_{k=0..n} A128973(n,k).

a(2^k+m) = 3*a(m) for 0 <= m <= 2^(k-1) - 1, k >= 1.

a(4*n) = a(2*n) = A071053(n).

Extensions

a(48) and following terms corrected by Georg Fischer, Jul 04 2023